- 积分
- 271
- 下载分
- 分
- 威望
- 点
- 原创币
- 点
- 下载
- 次
- 上传
- 次
- 注册时间
- 2018-4-1
- 精华
|
发表于 2019-7-30 11:22:31
|
显示全部楼层
来自: 尼泊尔 来自 尼泊尔
I am not expert but trying to explain this circuit if wrong please correct it, As circuit above Q79 and Q77 are NPN transistor and this circuit if Q79 activated 5vl_en will ground . so, it should not be activated that is why DEPSLP must come LOW (Q79 transistor is for protection), while DEPSLP coming LOW 5vl_en remain active that is injected to base of Q77 to pull low , as Q75 and Q76 are PNP transistor need low to activate and convert 5vsb to 5vdual which is already done by Q77 |
|